Click Specification

(Non-preferred) dimensions in parentheses.

Dimensions Of Metric Socket Head Cap Screws

ASME/ANSI B 18.3.1M - 1986 (R2008)

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Thread Size
d

M1.6

M2.5

M10

P	Thread Pitch
d_s	max
d_s	min
d_k	max
d_k	min
k	max
k	min
c	max
s	Nominal Size
t	min
h	min
d_a	max
d_a	min
b	min

0.35	0.4	0.45	0.5	0.7	0.8	1	1.25	1.5
1.6	2	2.5	3	4	5	6	8	10
1.46	1.86	2.36	2.86	3.82	4.82	5.82	7.78	9.78
3	3.8	4.5	5.5	7	8.5	10	13	16
2.87	3.65	4.33	5.32	6.8	8.27	9.74	12.7	15.67
1.6	2	2.5	3	4	5	6	8	10
1.52	1.91	2.4	2.89	3.88	4.86	5.85	7.83	9.81
0.16	0.2	0.25	0.3	0.4	0.5	0.6	0.8	1
1.5	1.5	2	2.5	3	4	5	6	8
0.8	1	1.25	1.5	2	2.5	3	4	5
0.54	0.68	0.85	1.02	1.52	1.9	2.28	3.2	4
2	2.6	3.1	3.6	4.7	5.7	6.8	9.2	11.2
1.8	2.2	2.7	3.2	4.4	5.4	6.5	8.8	10.8
15.2	16	17	18	20	22	24	28	32

Thread Size
d

M12

(M14)

M16

M20

M24

M30

M36

M42

M48

P	Thread Pitch
d_s	max
d_s	min
d_k	max
d_k	min
k	max
k	min
c	max
s	Nominal Size
t	min
h	min
d_a	max
d_a	min
b	min

1.75	2	2	2.5	3	3.5	4	4.5	5
12	14	16	20	24	30	36	42	48
11.73	13.73	15.73	19.67	23.67	29.67	35.61	41.61	47.61
18	21	24	30	36	45	54	63	72
17.63	20.6	23.58	29.53	35.48	44.42	53.37	62.31	71.27
12	14	16	20	24	30	36	42	48
11.79	13.77	15.76	19.73	23.7	29.67	35.64	41.61	47.58
1.20	1.40	1.60	2.00	2.40	3.00	3.60	4.20	4.80
10	12	14	17	19	22	27	32	36
6	7	8	10	12	15	18	21	24
4.8	5.6	6.4	8	9.6	12	14.4	16.8	19.2
14.2	16.2	18.2	22.4	26.4	33.4	39.4	45.6	52.6
13.2	15.2	17.2	21.6	25.6	32	38	44.4	51.2
36	40	44	52	60	72	84	96	108

Alternative history

ANSI/ASME B 18.3.1M - 1986(R1993) ANSI/ASME B 18.3.1M - 1986(R2008)

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